diff options
Diffstat (limited to 'sys/gnu/ext2fs/ext2_inode.c')
| -rw-r--r-- | sys/gnu/ext2fs/ext2_inode.c | 536 |
1 files changed, 0 insertions, 536 deletions
diff --git a/sys/gnu/ext2fs/ext2_inode.c b/sys/gnu/ext2fs/ext2_inode.c deleted file mode 100644 index 46ba9d1..0000000 --- a/sys/gnu/ext2fs/ext2_inode.c +++ /dev/null @@ -1,536 +0,0 @@ -/*- - * modified for Lites 1.1 - * - * Aug 1995, Godmar Back (gback@cs.utah.edu) - * University of Utah, Department of Computer Science - */ -/*- - * Copyright (c) 1982, 1986, 1989, 1993 - * The Regents of the University of California. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * @(#)ffs_inode.c 8.5 (Berkeley) 12/30/93 - * $FreeBSD$ - */ - -#include <sys/param.h> -#include <sys/systm.h> -#include <sys/mount.h> -#include <sys/bio.h> -#include <sys/buf.h> -#include <sys/vnode.h> -#include <sys/malloc.h> - -#include <vm/vm.h> -#include <vm/vm_extern.h> - -#include <gnu/ext2fs/inode.h> -#include <gnu/ext2fs/ext2_mount.h> -#include <gnu/ext2fs/ext2_fs.h> -#include <gnu/ext2fs/ext2_fs_sb.h> -#include <gnu/ext2fs/fs.h> -#include <gnu/ext2fs/ext2_extern.h> - -static int ext2_indirtrunc(struct inode *, int32_t, int32_t, int32_t, int, - long *); - -/* - * Update the access, modified, and inode change times as specified by the - * IN_ACCESS, IN_UPDATE, and IN_CHANGE flags respectively. Write the inode - * to disk if the IN_MODIFIED flag is set (it may be set initially, or by - * the timestamp update). The IN_LAZYMOD flag is set to force a write - * later if not now. If we write now, then clear both IN_MODIFIED and - * IN_LAZYMOD to reflect the presumably successful write, and if waitfor is - * set, then wait for the write to complete. - */ -int -ext2_update(vp, waitfor) - struct vnode *vp; - int waitfor; -{ - struct ext2_sb_info *fs; - struct buf *bp; - struct inode *ip; - int error; - - ext2_itimes(vp); - ip = VTOI(vp); - if ((ip->i_flag & IN_MODIFIED) == 0) - return (0); - ip->i_flag &= ~(IN_LAZYMOD | IN_MODIFIED); - if (vp->v_mount->mnt_flag & MNT_RDONLY) - return (0); - fs = ip->i_e2fs; - if ((error = bread(ip->i_devvp, - fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), - (int)fs->s_blocksize, NOCRED, &bp)) != 0) { - brelse(bp); - return (error); - } - ext2_i2ei(ip, (struct ext2_inode *)((char *)bp->b_data + - EXT2_INODE_SIZE * ino_to_fsbo(fs, ip->i_number))); - if (waitfor && (vp->v_mount->mnt_flag & MNT_ASYNC) == 0) - return (bwrite(bp)); - else { - bdwrite(bp); - return (0); - } -} - -#define SINGLE 0 /* index of single indirect block */ -#define DOUBLE 1 /* index of double indirect block */ -#define TRIPLE 2 /* index of triple indirect block */ -/* - * Truncate the inode oip to at most length size, freeing the - * disk blocks. - */ -int -ext2_truncate(vp, length, flags, cred, td) - struct vnode *vp; - off_t length; - int flags; - struct ucred *cred; - struct thread *td; -{ - struct vnode *ovp = vp; - int32_t lastblock; - struct inode *oip; - int32_t bn, lbn, lastiblock[NIADDR], indir_lbn[NIADDR]; - int32_t oldblks[NDADDR + NIADDR], newblks[NDADDR + NIADDR]; - struct ext2_sb_info *fs; - struct buf *bp; - int offset, size, level; - long count, nblocks, blocksreleased = 0; - int aflags, error, i, allerror; - off_t osize; -/* -printf("ext2_truncate called %d to %d\n", VTOI(ovp)->i_number, length); -*/ /* - * negative file sizes will totally break the code below and - * are not meaningful anyways. - */ - if (length < 0) - return EFBIG; - - oip = VTOI(ovp); - if (ovp->v_type == VLNK && - oip->i_size < ovp->v_mount->mnt_maxsymlinklen) { -#if DIAGNOSTIC - if (length != 0) - panic("ext2_truncate: partial truncate of symlink"); -#endif - bzero((char *)&oip->i_shortlink, (u_int)oip->i_size); - oip->i_size = 0; - oip->i_flag |= IN_CHANGE | IN_UPDATE; - return (ext2_update(ovp, 1)); - } - if (oip->i_size == length) { - oip->i_flag |= IN_CHANGE | IN_UPDATE; - return (ext2_update(ovp, 0)); - } - fs = oip->i_e2fs; - osize = oip->i_size; - ext2_discard_prealloc(oip); - /* - * Lengthen the size of the file. We must ensure that the - * last byte of the file is allocated. Since the smallest - * value of oszie is 0, length will be at least 1. - */ - if (osize < length) { - if (length > oip->i_e2fs->fs_maxfilesize) - return (EFBIG); - offset = blkoff(fs, length - 1); - lbn = lblkno(fs, length - 1); - aflags = B_CLRBUF; - if (flags & IO_SYNC) - aflags |= B_SYNC; - vnode_pager_setsize(ovp, length); - if ((error = ext2_balloc(oip, lbn, offset + 1, cred, &bp, - aflags)) != 0) - return (error); - oip->i_size = length; - if (aflags & IO_SYNC) - bwrite(bp); - else - bawrite(bp); - oip->i_flag |= IN_CHANGE | IN_UPDATE; - return (ext2_update(ovp, 1)); - } - /* - * Shorten the size of the file. If the file is not being - * truncated to a block boundry, the contents of the - * partial block following the end of the file must be - * zero'ed in case it ever become accessible again because - * of subsequent file growth. - */ - /* I don't understand the comment above */ - offset = blkoff(fs, length); - if (offset == 0) { - oip->i_size = length; - } else { - lbn = lblkno(fs, length); - aflags = B_CLRBUF; - if (flags & IO_SYNC) - aflags |= B_SYNC; - if ((error = ext2_balloc(oip, lbn, offset, cred, &bp, - aflags)) != 0) - return (error); - oip->i_size = length; - size = blksize(fs, oip, lbn); - bzero((char *)bp->b_data + offset, (u_int)(size - offset)); - allocbuf(bp, size); - if (aflags & IO_SYNC) - bwrite(bp); - else - bawrite(bp); - } - /* - * Calculate index into inode's block list of - * last direct and indirect blocks (if any) - * which we want to keep. Lastblock is -1 when - * the file is truncated to 0. - */ - lastblock = lblkno(fs, length + fs->s_blocksize - 1) - 1; - lastiblock[SINGLE] = lastblock - NDADDR; - lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs); - lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs); - nblocks = btodb(fs->s_blocksize); - /* - * Update file and block pointers on disk before we start freeing - * blocks. If we crash before free'ing blocks below, the blocks - * will be returned to the free list. lastiblock values are also - * normalized to -1 for calls to ext2_indirtrunc below. - */ - bcopy((caddr_t)&oip->i_db[0], (caddr_t)oldblks, sizeof oldblks); - for (level = TRIPLE; level >= SINGLE; level--) - if (lastiblock[level] < 0) { - oip->i_ib[level] = 0; - lastiblock[level] = -1; - } - for (i = NDADDR - 1; i > lastblock; i--) - oip->i_db[i] = 0; - oip->i_flag |= IN_CHANGE | IN_UPDATE; - allerror = ext2_update(ovp, 1); - - /* - * Having written the new inode to disk, save its new configuration - * and put back the old block pointers long enough to process them. - * Note that we save the new block configuration so we can check it - * when we are done. - */ - bcopy((caddr_t)&oip->i_db[0], (caddr_t)newblks, sizeof newblks); - bcopy((caddr_t)oldblks, (caddr_t)&oip->i_db[0], sizeof oldblks); - oip->i_size = osize; - error = vtruncbuf(ovp, cred, td, length, (int)fs->s_blocksize); - if (error && (allerror == 0)) - allerror = error; - - /* - * Indirect blocks first. - */ - indir_lbn[SINGLE] = -NDADDR; - indir_lbn[DOUBLE] = indir_lbn[SINGLE] - NINDIR(fs) - 1; - indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - NINDIR(fs) * NINDIR(fs) - 1; - for (level = TRIPLE; level >= SINGLE; level--) { - bn = oip->i_ib[level]; - if (bn != 0) { - error = ext2_indirtrunc(oip, indir_lbn[level], - fsbtodb(fs, bn), lastiblock[level], level, &count); - if (error) - allerror = error; - blocksreleased += count; - if (lastiblock[level] < 0) { - oip->i_ib[level] = 0; - ext2_blkfree(oip, bn, fs->s_frag_size); - blocksreleased += nblocks; - } - } - if (lastiblock[level] >= 0) - goto done; - } - - /* - * All whole direct blocks or frags. - */ - for (i = NDADDR - 1; i > lastblock; i--) { - long bsize; - - bn = oip->i_db[i]; - if (bn == 0) - continue; - oip->i_db[i] = 0; - bsize = blksize(fs, oip, i); - ext2_blkfree(oip, bn, bsize); - blocksreleased += btodb(bsize); - } - if (lastblock < 0) - goto done; - - /* - * Finally, look for a change in size of the - * last direct block; release any frags. - */ - bn = oip->i_db[lastblock]; - if (bn != 0) { - long oldspace, newspace; - - /* - * Calculate amount of space we're giving - * back as old block size minus new block size. - */ - oldspace = blksize(fs, oip, lastblock); - oip->i_size = length; - newspace = blksize(fs, oip, lastblock); - if (newspace == 0) - panic("itrunc: newspace"); - if (oldspace - newspace > 0) { - /* - * Block number of space to be free'd is - * the old block # plus the number of frags - * required for the storage we're keeping. - */ - bn += numfrags(fs, newspace); - ext2_blkfree(oip, bn, oldspace - newspace); - blocksreleased += btodb(oldspace - newspace); - } - } -done: -#if DIAGNOSTIC - for (level = SINGLE; level <= TRIPLE; level++) - if (newblks[NDADDR + level] != oip->i_ib[level]) - panic("itrunc1"); - for (i = 0; i < NDADDR; i++) - if (newblks[i] != oip->i_db[i]) - panic("itrunc2"); - VI_LOCK(ovp); - if (length == 0 && (ovp->v_bufobj.bo_dirty.bv_cnt != 0 || - ovp->v_bufobj.bo_clean.bv_cnt != 0)) - panic("itrunc3"); - VI_UNLOCK(ovp); -#endif /* DIAGNOSTIC */ - /* - * Put back the real size. - */ - oip->i_size = length; - oip->i_blocks -= blocksreleased; - if (oip->i_blocks < 0) /* sanity */ - oip->i_blocks = 0; - oip->i_flag |= IN_CHANGE; - vnode_pager_setsize(ovp, length); - return (allerror); -} - -/* - * Release blocks associated with the inode ip and stored in the indirect - * block bn. Blocks are free'd in LIFO order up to (but not including) - * lastbn. If level is greater than SINGLE, the block is an indirect block - * and recursive calls to indirtrunc must be used to cleanse other indirect - * blocks. - * - * NB: triple indirect blocks are untested. - */ - -static int -ext2_indirtrunc(ip, lbn, dbn, lastbn, level, countp) - struct inode *ip; - int32_t lbn, lastbn; - int32_t dbn; - int level; - long *countp; -{ - struct buf *bp; - struct ext2_sb_info *fs = ip->i_e2fs; - struct vnode *vp; - int32_t *bap, *copy, nb, nlbn, last; - long blkcount, factor; - int i, nblocks, blocksreleased = 0; - int error = 0, allerror = 0; - - /* - * Calculate index in current block of last - * block to be kept. -1 indicates the entire - * block so we need not calculate the index. - */ - factor = 1; - for (i = SINGLE; i < level; i++) - factor *= NINDIR(fs); - last = lastbn; - if (lastbn > 0) - last /= factor; - nblocks = btodb(fs->s_blocksize); - /* - * Get buffer of block pointers, zero those entries corresponding - * to blocks to be free'd, and update on disk copy first. Since - * double(triple) indirect before single(double) indirect, calls - * to bmap on these blocks will fail. However, we already have - * the on disk address, so we have to set the b_blkno field - * explicitly instead of letting bread do everything for us. - */ - vp = ITOV(ip); - bp = getblk(vp, lbn, (int)fs->s_blocksize, 0, 0, 0); - if (bp->b_flags & (B_DONE | B_DELWRI)) { - } else { - bp->b_iocmd = BIO_READ; - if (bp->b_bcount > bp->b_bufsize) - panic("ext2_indirtrunc: bad buffer size"); - bp->b_blkno = dbn; - vfs_busy_pages(bp, 0); - bp->b_iooffset = dbtob(bp->b_blkno); - bstrategy(bp); - error = bufwait(bp); - } - if (error) { - brelse(bp); - *countp = 0; - return (error); - } - - bap = (int32_t *)bp->b_data; - MALLOC(copy, int32_t *, fs->s_blocksize, M_TEMP, M_WAITOK); - bcopy((caddr_t)bap, (caddr_t)copy, (u_int)fs->s_blocksize); - bzero((caddr_t)&bap[last + 1], - (u_int)(NINDIR(fs) - (last + 1)) * sizeof (int32_t)); - if (last == -1) - bp->b_flags |= B_INVAL; - error = bwrite(bp); - if (error) - allerror = error; - bap = copy; - - /* - * Recursively free totally unused blocks. - */ - for (i = NINDIR(fs) - 1, nlbn = lbn + 1 - i * factor; i > last; - i--, nlbn += factor) { - nb = bap[i]; - if (nb == 0) - continue; - if (level > SINGLE) { - if ((error = ext2_indirtrunc(ip, nlbn, - fsbtodb(fs, nb), (int32_t)-1, level - 1, &blkcount)) != 0) - allerror = error; - blocksreleased += blkcount; - } - ext2_blkfree(ip, nb, fs->s_blocksize); - blocksreleased += nblocks; - } - - /* - * Recursively free last partial block. - */ - if (level > SINGLE && lastbn >= 0) { - last = lastbn % factor; - nb = bap[i]; - if (nb != 0) { - if ((error = ext2_indirtrunc(ip, nlbn, fsbtodb(fs, nb), - last, level - 1, &blkcount)) != 0) - allerror = error; - blocksreleased += blkcount; - } - } - FREE(copy, M_TEMP); - *countp = blocksreleased; - return (allerror); -} - -/* - * discard preallocated blocks - */ -int -ext2_inactive(ap) - struct vop_inactive_args /* { - struct vnode *a_vp; - struct thread *a_td; - } */ *ap; -{ - struct vnode *vp = ap->a_vp; - struct inode *ip = VTOI(vp); - struct thread *td = ap->a_td; - int mode, error = 0; - - ext2_discard_prealloc(ip); - if (prtactive && vrefcnt(vp) != 0) - vprint("ext2_inactive: pushing active", vp); - - /* - * Ignore inodes related to stale file handles. - */ - if (ip->i_mode == 0) - goto out; - if (ip->i_nlink <= 0) { - (void) vn_write_suspend_wait(vp, NULL, V_WAIT); - error = ext2_truncate(vp, (off_t)0, 0, NOCRED, td); - ip->i_rdev = 0; - mode = ip->i_mode; - ip->i_mode = 0; - ip->i_flag |= IN_CHANGE | IN_UPDATE; - ext2_vfree(vp, ip->i_number, mode); - } - if (ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) { - if ((ip->i_flag & (IN_CHANGE | IN_UPDATE | IN_MODIFIED)) == 0 && - vn_write_suspend_wait(vp, NULL, V_NOWAIT)) { - ip->i_flag &= ~IN_ACCESS; - } else { - (void) vn_write_suspend_wait(vp, NULL, V_WAIT); - ext2_update(vp, 0); - } - } -out: - /* - * If we are done with the inode, reclaim it - * so that it can be reused immediately. - */ - if (ip->i_mode == 0) - vrecycle(vp, td); - return (error); -} - -/* - * Reclaim an inode so that it can be used for other purposes. - */ -int -ext2_reclaim(ap) - struct vop_reclaim_args /* { - struct vnode *a_vp; - struct thread *a_td; - } */ *ap; -{ - struct inode *ip; - struct vnode *vp = ap->a_vp; - - if (prtactive && vrefcnt(vp) != 0) - vprint("ufs_reclaim: pushing active", vp); - ip = VTOI(vp); - if (ip->i_flag & IN_LAZYMOD) { - ip->i_flag |= IN_MODIFIED; - ext2_update(vp, 0); - } - vfs_hash_remove(vp); - FREE(vp->v_data, M_EXT2NODE); - vp->v_data = 0; - vnode_destroy_vobject(vp); - return (0); -} |
